Heat exchanger



A EY.

MAMA 70R K. MUHLEISEN HEAT EXCHANGER Filed Dec. 1, 1954 Patented Feb. 18, 1936 I UNETED STATES PATENT OFFICE HEAT EXCHANGER Karl Muhleisen, Philadelphia, Pa., assignor to Schutte & Koerting Company, Philadelphia, Pa., a corporation of Pennsylvania Application December 1, 1934, Serial No. 755,671

2 Claims. (Cl. 257-239) In a heat exchanger there is usually provided parallel with the tubes. As shown in Figure 2 a tube sheet loose in the shell and carried by one this pipe connection l2 extends away from the end of the tubes and a flanged head secured to tubes and is packed by a gland l3 through which the tube sheet and together with it, serving to it is afforded some range of movement. In either separate the two fluids, of which the pressure of case the pipe connection l2 or I2 serves to con at least one is above atmospheric pressure. It is vey the fluid of higher pressure, which is the fluid one object of the present invention to prevent which will leak into the annular groove, out of commingling of the two fluids by leakage at the the casing, and in that way prevent it from comjoint between the flanged head and the sheet and mingling with the other fluid. The pipe l2 or m to this end, generally stated, the invention corn- |2 not only serves the purpose indicated but prises an annular open groove provided at the also acts as a tell-tale and indicates from the joint and having pipe connections to the exoutside of the casing the occurrence of leakage. terior of the exchanger. It will be obvious to those skilled in the art to Other objects of the invention will appear from which the invention relates that modifications 3 5 the following description at the end of which the may be made in details of construction and arinvention will be claimed. rangement without departing from the spirit of In the following description reference will be the invention, which is not limited as to such made to the accompanying drawing forming part matters or otherwise than the prior art and the hereof and in which, appended claims may require. 53o Figure 1 is a View partly in elevation and partly I claim:

in section of one form of heat exchanger, se- 1. Aheat exchanger comprising in combination, lected from among other forms, and embodying a casing, a plurality of aligned tubes within said features of the invention, and casing, an inner tube sheet carried by said tubes Figure 2 is a detached illustration of a modiand movable relative to said casing, an inner head fication. having a domed portion spaced from said inner Referring to the w g, l i a t e ee ca tube sheet and opposite said tubes and having ried y the tubes 2 and movable in the casing 3 a peripheral flange thereon forming a joint with to allow for contraction and expansion. 4 is a said inner tube sheet, an annular groove formed flanged inner head secured to the tube sheet as in said joint between said tube sheet and said a.) shown by bolts 5. Between the flange of the inner inner head and encircling the ends of said tubes,

head 4 and the tube sheet there is shown a gasket a pipe forming a drain from said groove and ex- 6. One fluid enters the casing, for example at tending through said casing, and a gland sealing I, and leaves it at 8 flowing around the outside said pipe to said casing where said pipe passes of the tube. The other fluid enters the casing through said casing and affording limited moveas at 9 and flows through some of the tubes toment to said pipe relative to said casing.

ward the inner head 4 and then back through 2. In a heat exchanger having a casing and a the rest of the tubes leaving the casing at II]. It plurality of tubes in said casing, a floating tube is evident that the joint between the tube sheet sheet construction comprising, an inner tube I and the flange of the inner head 4 serves to sheet, an inner head secured to said tube sheet 0 D eVe t Co m n l ng of the two fluids so that if and having a portion spaced from said tube sheet th joint should leak the fluids would comm gle to provide a passageway for fluid therebetween which, of cour e, s y undesirable- According and having a portion forming a sealing joint with to the present invention this is preven ed by th said tube sheet, an annular groove in said joint provision of an annular groove I l between the between said tube sheet and said head and encir- 45 inner head 4 and the tube sheet I. This groove cling said passageway to receive fluid leaking y be provided ill the flange of e inner e d toward or away from said passageway, and means 4, as shown in Figure 1, or in the tube sheet I, communicating with said groove and extending as indicated in Figure 2. In either case there through said casing and providing a drain for is a pipe connection to the exterior of the shell said groove. 0 3 from this groove. In Figure 1 the pipe connec- KARL MUHLEISEN.

tion is shown at l2 and it extends more or less 

